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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db4d4a4dd1a028b23f3eb7e24344350131efd7507c2269f1fc3e7d651e85de9' 
  AND token = 'xJSpSBowZGS88oyH7NwILjSPmNT+mM8zHJK3w45cBVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}